Ice-making machine.



W. GRAAFP.

ICE MAKING MACHINE. APPLICATION FILED SEPT. 26, 1911.

Patented June 30, 1914,

[42' van Z 2: fM/m WILHELM GRAAFF, OF BERLIN, GERMANY.

ICE-MAKING MACHINE.

Specification of Letters Patent.

Application filed September 26, 1911.

Patented June 30, 1914. Serial No. 651,895.

To all whom it may concern:

Be it known that I, WILHELM GRAAFF, merchant, a subject of the German Emperor, and residing at 17 Linkstrasse, Berlin, W. A., in the Kingdom of Prussia, Ger many, have invented certain new and useful Improvements in Ice-Making Machines, of which thefollowi-ng is a specification. The present invention relates to improvements in still-absorbers acting alternately as distiller and absorber or condenser and refrigerator. Machines of this kind are described in the U. S. Patent No. 958,683.

The subject matter of this invention resides in a still absorber of this typeprovided with an inner shell surrounded by an outer jacket leaving a space between them containing the heating or cooling medium respectively. This jacket may be connected to the shell in an easily detachable manner or be rigidly secured thereto. When the stillabsorber is rotated, as is the case with the ice making machine according to the U. S. Patent No. 958,683 the entrance for the cooling medium is preferably admit-ted in theaxial direction of the vessel to be cooled, and so arranged that the said vessel can be rotated together with its jacket without the flexible tube serving for the supply of the cooling medium, participating in such rotation.

In the accompanying drawing one embodiment of the present invention is illustrated and: Figure 1 shows in longitudinal section the still-absorber as constructed for an ice making machine according to U. S. Patent No. 958,683 and; Fig. 2 a sectional View of the device for closing the entrance for the cooling medium; and Fig. 3 a sectional view of a detail in larger scale.

In the drawing, a is the shell of the stillabsorber for an ice making machine and b is a jacket surrounding the shell leaving a space between them. In the constructional form shown this jacket is connected in an easily detachable manner with the vessel a. For this purpose it is fitted with a sleeve 0, which is mounted to revolve in a bearing d. This sleeve fits closely over the trunnion e of the vessel or shell a. The trunnion 6,

arranged axially with the shell (1, is hollow and is provided with a screw threaded stopper for closing the shell when emptied. The trunnion c has longitudinal ducts 0, communicating with the shell a andjacket b when space between the assembled for the insertion of the cooling or heating medium.

respectively. Upon assembling the jacket over the shell the sleeve 0 fits closely around the trunnion e.

The jacket Z) is provided with a drain pipe 72., having suitable closing means which is only used during the heating period of the machine. This closing means comprisesa hood suitably threaded to be screwed on or otherwise securely fastened over the drain pipe it, and comprising the gasket r. The hood is provided with a safety valve 8 opening outward. A spring 1) around the valve spindle t, acting between a shoulder w and a nut it, tends to keep the valve closed. By tightening compression of the spring may be varied as required, so that the time for opening the valve may be regulated in accordance with the permissible pressure for the heating medium in the jacket 7). Whenever the jacket I) is to serve as cooling-jacket, the hood 9 is removed to permit a quick and free flow of the cooling medium through the jacket. The sleeve 0 is provided with an opening 2' at its free end. In front of this opening is arranged a nipple 7c, over which lies a spring m which bears with one end on a cap a secured on the sleeve 0, by means of a screw thread, and with its other end on a flange of the nipple 70 so that the latter is pressed securely and forming a tight joint against the sleeve 0. By this means of connecting the nipple Z: and the sleeve 0 it is possible to r0- tate the latter together with the shell a and the jacket 6, while the nipple remains stationary. The cooling liquid entering throu h the nipple is into the sleeve 0 can pass t rough the passages 0 into the space between the jacket Z) and the shell a. After the cap has been loosened, the nipple k can be removed from the sleeve 0 and in its place the tightly closing cap p, see Fig. 2, may be substituted.

In order to make a firm connection between the jacket 6 and the shell (1, elbow shaped latches are provided near the right end of the jacket 6, which consist of a lever mounted to turn on the jacket. At the end of the short arm of these levers f are provided U-shaped eyelets which engage over hoops on the ring 9, attached to the shell a. By turning the lever f toward the left of the drawing this clamping arrangement is loosened, releasing the ring g, whereupon the shell or. may be removed from the jacket.

ing and consequent destruction of the absorbing means contained in the shell a. Be-

fore starting the heatingoperation'a fluid, such as brine or oil is for this reason injected into said space. 1

The apparatus operates in the following mannerLWhen during the distilling period, the shell (1. .is to be heated, the cap 2 is secured on the sleeve 0 and'a heat transmitting medium such as water, brine or oil is filled intothe space between the shell a and jacket 6. The pipe h is now closed by means of a valve and the jacketheated; Any vapors from the heat transmitting medium may escape through the safety valv in the pipe h. Assoon as the jacket I) has been heated sufficiently and the absorbing period is to be commenced, the safety valve is -closed tightly, the cap p is thereupon removed from i the trunnionand replaced by the cap m with the nipple k. The cooling liquid is now allowed to enter through the nipple k, the sleeve 0, and passages 0, into the space be tween the shell a and jacket b. When the .machine is now being rotated this cooling liquid will flow around the shell a and escape through the pipe h. Obviously the jacket and shell, instead of being constructed in two parts as shown on the drawing may be made integral, or the jacket may be made stationary ermitting the vessel or shell to rotate inside it. In the latter case the cooling medium would be entered at the top of the jacket and means provided to distribute it over the whole length of the inner vessel.

I claim:

1. In a still'absorber, an inner vessel, a jacket surrounding said vessel leaving an intervening space between them, an entrance for the cold transmitting medium, a cap for temporarily closin saidentrance, an opening in said jacket or draining off said medium, and a closure for said opening containing a safety valve.

2. In a still-absorber, a rotatable vessel, a jacket connected theretoand surrounding it so as to leave an intervening s ace between them, a coupling admitting o introducing the refrigeratin medium into the space between said vesse and said jacket during the rotation of the machine and an outlet from said jacket and detachable means for rigidly holding jacket and vessel together.

3. A still-absorber comprising an inner vessel and a surrounding jacket, a space formed between the vessel and the jacket for a cold transmitting medium, an outlet from said vessel and, in axial alinement therewith, a trunnion on said vessel; a sleeve in said jacket adapted to fit closely around said trunnion and a bearing in which said sleeve with the trunnion may revolve; a nipple revolubly mounted on said sleeve, and a cap adapted to replace said nipple for closing the sleeve; said trunnion aving amages for admitting cold transmitting me ium entering said nipple, into said sipace clamping means at the opposite end 0 the acket for securing said vessel centrally thereln; a radial outlet on said jacket for said medium and a safety valve in said outlet.

In testimony whereof I aflix my signature in presence of two witnesses.

. WILHELM GRAAFF. Witnesses:

Louis E, Pmmrson,

Wommun Ham. 

